However if you try to select the text on page 2, you'll see that the layout engine didn't actually place the formula into its own section. Not only is it broken, with the sum signs missing, it is also jumbled up with the text below it, resulting in weird - text broken formula - text - broken formula - mumbo jumbo.
This would make it extremely hard if not impossible to properly follow the paper with a screen reader.
The figures on page 6 also produce weird artefacts on the text layer. In HTML for example you'd simply present the alt-text to the person with the screen reader, but TeX doesn't have such a feature in most vector drawing libs afaik.
The table on page 8 is also not correct in terms of the text layer. If you select it you can see that you get the top half of the leftmost column followed by the rightmost column, followed by the rest in some order.
If I may also direct your attention to this gem on page 9: "Then at least half of allnodeshaveh ̄=lgn =lgn−1(seethepaperforthedefinitionofh ̄),and 2√ thus a potential of Ω( lg n). Therefore, the total heap potential would be lg n). Conjecture: the same construction works for the fancy potential √ √ function, which would give a bound of Θ(n · 4 lg lg n)."
Shall I go on ^^?